Instability analysis of deepwater riser with fairings

Mahdi Khorasanchi, Shan Huang

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The paper investigates the mechanism of instability of deepwater risers fitted with fairings and presents an analytical model to predict the instability onset conditions. The simplified case of a two-dimensional (2D) problem was considered. The governing equations were derived, and the hydrodynamic forces were calculated and the effect of motion in these forces was taken into consideration. The final equations were linearised and an eigenvalue analysis was employed to systematically examine the stability with the emphasis on identifying the critical current speed for a given system. This model was validated against the available test results and showed a good agreement. A parametric study was also carried out. It showed the significant role of the hydrodynamic coefficients as well as mass distribution in the stability of the system.
LanguageEnglish
Pages26-34
JournalOcean Engineering
Volume79
Early online date1 Feb 2014
DOIs
Publication statusPublished - 15 Mar 2014

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Hydrodynamics
Critical currents
Analytical models

Keywords

  • riser
  • fairing
  • instability
  • VIV

Cite this

Khorasanchi, Mahdi ; Huang, Shan. / Instability analysis of deepwater riser with fairings. In: Ocean Engineering. 2014 ; Vol. 79. pp. 26-34.
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Instability analysis of deepwater riser with fairings. / Khorasanchi, Mahdi; Huang, Shan.

In: Ocean Engineering, Vol. 79, 15.03.2014, p. 26-34.

Research output: Contribution to journalArticle

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AB - The paper investigates the mechanism of instability of deepwater risers fitted with fairings and presents an analytical model to predict the instability onset conditions. The simplified case of a two-dimensional (2D) problem was considered. The governing equations were derived, and the hydrodynamic forces were calculated and the effect of motion in these forces was taken into consideration. The final equations were linearised and an eigenvalue analysis was employed to systematically examine the stability with the emphasis on identifying the critical current speed for a given system. This model was validated against the available test results and showed a good agreement. A parametric study was also carried out. It showed the significant role of the hydrodynamic coefficients as well as mass distribution in the stability of the system.

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